Rail-drilling machine.



F. E. PLACE & M. L. JENKINS. RAIL DRILLING MACHINE.

APPLICATION FILED MAR.25, 1907.

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WITNESSES INVENTORS,

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F. E. PLAGE 6L M. L.,y JENKINS. RAIL DRILLING MACHINE.

APPLICATION FILED MAR. 25, 1907.

962,91 4. Patented June 28,1910.

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UNITED STATES PATENT OFFICE.

FREDERICK E. PLACE, OF CHICAGO, AND MERRILL L. JENKINS, OF HARVEY, ILLINOIS, ASSIGNORS T0 BUDA FOUNDRY & MANUFACTURING COMPANY, OF CHICAGO,

ILLINOIS.

RAIL-DRILLING MACHINE.

To all whom it may concern:

Be it known that we, FREDERICK E. PLACE and MERRILL L. JENKINS, citizens of the United States, residing, respectively, at Chicago and Harvey, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Rail- Drilling Machines, of which the following is a specification.

Our invention relates to rail drilling machines, and has forits objects; to provide a rail drilling machine having an improved form of feed; to provide a cheap, simple and easily assembled form of antifriction thrust support for the drill holder; and to provide a drill where in the leverage of the driving crank may be varied to suit the size of drill employed. These and other objects are accomplished, by our invention, one form of which is illustrated `in the accompanying drawings, wherein Figure 1 is a longitudinal section through the center of the machine.

Figure 2 is a transverse section on the line II-II of Figure 1.

Figure 8 is a detail of the shaft for operatin the feeding pawl.

Figure 4 is a plan view with a portion of the vertical frame work broken away to more clearly show the parts'beneath, and

Figure 5 is a transverse section on the line V-V of Figure 4.

The machine is of the hand operated portable type, and comprises in the main a vertical foldable portion, carrying the driving crank, and a horizontal portion adapted to be'clamped to the rail in the usual manner, and carrying the drill holder and feed mechanism, together with driving connections between the crank, drill holder and feed mechanism. The feed is of the quick setting type, provided with means for hand operation, to bring the drill quickly against the work, and an automatic feeding connection whereby the drill is fed forward or backward if desired at a speed proportional to its rotary movement.

Referring to the drawings, 1 is the horizontal portlon-of the frame work, which is providedvwith the usual swinging clamp 2 for engaging the rail, and 3 is the uprlght part of the frame which carries the operating crank 4, which yertical framev work 1s pivoted to the horizontal frame by the bolt 5, and is held in upright position by means of Specification of Letters Patent.

Application filed March 25, 1907.

Patented June 28, 1910.

Serial N o. 364,349

the rule jointed members 6 and 7. The drill holder 8 which carries the drill 9, is mounted in the horizontal frame and is driven by virt-ue of the spline and groove connection with the bevel gear 10, which latter gear is driven by the tram of gearin comprisin the bevel gear 11, the vertical s aft 12, the evel gear 13, and the bevel gear 14, which latter gear 14 is mounted on the transverse shaft 15 carrying the cranks 16. The cranks 4 are secured to the shaft 15 by means of the collars 17, which collarsare provided with transverse openings in which the cranks 1G are adapted to be adjustably secured by means of the set screws 18. This arrangement, it will be noted, provides for an adjustment of the leverage. when the size of drill employed is varied.

The feeding mechanism, which constitutes a feature of our invention, will now be described. The primary member of this mechanism is the screw 19, which bears at its front end against the rear end of the screw holder, and is adapted to be reciprocated to give the desired feed. The front end of the feed screw as shown in Figure 1, is made cylindrical and into this end, the reduced rear end 20 of the drill holder fits. This reduced end 20 is provided with a circumferential groove 21 into which a-screw 22,

extending through the cylindrical wall of the feed screw 19, lits and thus provides for a swiveled connection between the two parts. In order that the friction, due to the thrust of the drill, may be reduced, hardenedbearing members 23 and 24 are fitted between the shoulder on the drill holder and the end of lars 27 and 28, engaging it at either side and secured to the frame. This feed nut is providedon its periphery with' a spur gear 29, which gear is in enga ement with the pinion 30 mounted on the s aft 31, and operable by the handle 32. This mechanism constitutes a means for bringing the drill up rapidly to'position against the rail, preliminary to the real drilling operation. In order that an automatic feed may be secured, during the drilling operation, connections are provided between the gear 29, and the bevel gear 10, which connections include the shaft 34, shown in Figure 4, and extending from a point with one end opposite the gear 10 to a position with the other end opposite the feed nut. One end of this shaft is provided with an off set arm 35, (see Figure 3), which arm 35 carries the pawl 36, having its nose in engagement with the gear on the periphery of the feed nut. The other end of the shaft 34, carries the arm 37 (see Figure 5), on which arm a roller 38 is mounted, which roller is in en agement with a cam 33, forming 'the'frontside of the gear 10. By this arrangement an oscillatory motion of the shaft 34 is secured, and a step by step movement of the feed nut in a forward direction. The roller 38 is held against the cam 33, by means of coil springs 45-45, shown in Figure 4, lwhich springs are attached at one of their ends to the shaft, and at the other of their ends to the framework. In order to regulate the amount of feed secured by the oscillation of the pawl 36, a shield 39 is provided for regulating the point at which the nose of the pawl engages the teeth of the spur ear. This shield 39 is provided with a s ot, through which the bolt 40 extends, which bolt 40 is provided with the clamping nut 4l, so that the head of the bolt 40 can be brou ht'up against the plate 39, and hold it firm y in any adjusted position.

Assuming that the'clamp 2 has just been applied to the rail, and that the drill is in its retracted position, the operation is as follows. In order to bring the drill point up rapidly against the web of the rail, the handle 32 is turned by hand, thus rotating the pinion 31, and feed nut 26, and advancing the feed Screw 19, which movement carries the drill rapidly forward to its operative position. The drill being in position for operation, the handles or cranks 16 are r0- tated, thus rotating the bevel gear 10 by virtue of the train of connections including the parts 11, 12, 13, 14, and 15, which gear l0 because of the splineand groove connection with the drill holder 9, rotates such drill holder, and permits of a longitudinal movement. The rotation of the gear 10 causes the oscillation of the shaft 34, due to the engagement of the roller 38 with the eccentric 33, and su'ch oscillation gives the feed nut an intermittent step by ste movement due to the engagement with t e pawl '36, carried by the connecting arm 35 on the shaft 34. In withdrawing the drill, the op eration of the parts is of course reversed, and the drill moves rapidly backward by means of a backward rotation of the handle 32.

Having thus described our invention and illustrated its use, what we claim as new and desire to secure by Letters Patent is the following The combination with a feeding member having a cylindrical end, of a driven member provided atits rear end with a shoulder and a reduced circumferentially grooved end fitting the said cylindrical end, a pair of annular bearing members with interposed balls fitting between the cylindrical end and the shoulder, a retaining sleeve fitting the exterior of the cylindrical end and the driven member, and a retaining member extending through the retaining sleeve and cylindrical end into the groove in the reduced end.

In testimony whereof we have hereunto signed our names in the presence of the two subscribed wit-nesses.

FREDERICK E. PLACE. MERRILL L. JENKINS. Witnesses:

JOHN L. WALKER, C. E. ELDRUD. 

